/*
 * Copyright 2022 ByteDance Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package atghelper

import (
	"sync"
)

func init() {
	GlobalFileLock = &memoryLock{}
}

var GlobalFileLock RWLocker

type RWLocker interface {
	Lock() error
	Unlock() error
	RLock() error
	RUnlock() error
}

type memoryLock struct {
	l sync.RWMutex
}

func (m *memoryLock) Lock() error {
	m.l.Lock()
	return nil
}

func (m *memoryLock) RLock() error {
	m.l.RLock()
	return nil
}

func (m *memoryLock) Unlock() error {
	m.l.Unlock()
	return nil
}

func (m *memoryLock) RUnlock() error {
	m.l.RUnlock()
	return nil
}
